gradle-wrapper: Add distributionSha256Sum
gradle-wrapper: Add distributionSha256Sum

Generated by:
./gradlew wrapper --gradle-version 6.3 \
    --distribution-type all \
    --gradle-distribution-sha256-sum 0f316a67b971b7b571dac7215dcf2591a30994b3450e0629925ffcfe2c68cc5c

Corresponds to https://gradle.org/release-checksums/
> Binary-only (-bin) ZIP Checksum:
> 038794feef1f4745c6347107b6726279d1c824f3fc634b60f86ace1e9fbd1768
> Complete (-all) ZIP Checksum:
> 0f316a67b971b7b571dac7215dcf2591a30994b3450e0629925ffcfe2c68cc5c
> Wrapper JAR Checksum:
> 1cef53de8dc192036e7b0cc47584449b0cf570a00d560bfaa6c9eabe06e1fc06

jruesga/rview,jruesga/rview,jruesga/rview